CountDownLatch
A counter, a thread is finished on a record, as the number of newspapers, but is decreasing. When reduced to 0 will release
load equivalent to the game, all the players are only loaded, in order to enter the game
in which the player is equivalent to sub-thread, the whole game is the main thread
import java.util.Random;
import java.util.concurrent.CountDownLatch;
/**
*
*/
/***
* @author 18071
* @Date 2019年3月25日
* 功能: Java并发编程：CountDownLatch、CyclicBarrier和Semaphore
***/
public class test {
public static void main(String args[]) throws InterruptedException {
CountDownLatch latch = new CountDownLatch(4);
for(int i = 0; i < latch.getCount(); i++){
new Thread(new mythread(latch), "player"+i).start();
}
System.out.println("正在等待所有玩家准备好");
latch.await();
System.out.println("开始游戏");
}
}
class mythread implements Runnable {
private CountDownLatch latch;
public mythread(CountDownLatch latch) {
this.latch=latch;
}
/* (non-Javadoc)
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
// TODO Auto-generated method stub
Random rand = new Random();
int randomNum = rand.nextInt((3000 - 1000) + 1) + 1000;//产生1000到3000之间的随机整数
try {
Thread.sleep(randomNum);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+" 已经准备好了, 所使用的时间为 "+((double)randomNum/1000)+"s");
//该线程完成 之后 使计数器减一，当所有线程 （或者是n个线程）完成之后 计数器 变为 0，继续执行主线程 main
latch.countDown();
}
}
CyclicBarrier
Represents the cycle of obstacles, like a sluice, thread execution wanted water, it will be blocked at the sluice, until the water is full (thread in attendance), and began to bleed.
/**
*
*/
/***
* @author 18071
* @Date 2019年3月25日
* 功能:
***/
import java.util.Random;
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
/**
*
*/
/***
* @author 18071
* @Date 2019年3月25日
* 功能:
***/
public class enn {
public static void main(String args[]) {
CyclicBarrier barrier =new CyclicBarrier (3) ;
for(int i=0;i<3;i++) {
new Thread( new mythrea1(barrier),"队友"+i).start();
}
System.out.println("main function is finished.");
}
}
class mythrea1 implements Runnable {
CyclicBarrier barrier ;
public mythrea1(CyclicBarrier barrier) {
this.barrier=barrier;
}
@Override
public void run() {
for(int i=1;i<6;i++)
{
Random rand = new Random();
int randomNum = rand.nextInt((3000 - 1000) + 1) + 1000;//产生1000到3000之间的随机整数
try {
Thread.sleep(randomNum);
try {
barrier.await();
} catch (BrokenBarrierException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+" 已经越过了第"+i+"个拦截物, 所使用的时间为 "+((double)randomNum/1000)+"s");
}
}
}
Each must three threads are executed barrier.await (); were to be equal to the next round will start after 3
